Hand truck attachment



FIG. 1 is a perspective view of the hand truck attachment, showing my new design;

FIG. 2 is a bottom perspective view shown at a larger scale;

FIG. 3 is a right-side elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is top plan view shown at a larger scale thereof;

FIG. 6 is a bottom plan view shown at a larger scale thereof; and,

FIG. 7 is a front elevation view thereof. 

CLAIM The ornamental design for a hand truck attachment, as shown. 